. Elementary lessons in the physics of agriculture. Agricultural physics. 25 38. The High Speed of Centrifuges.— This is secured by a combination of wheels and axles connected with belts. Suppose the diameter of the fly-wheel of the engine is twenty- four inches and it makes two hundred and twenty revolutions per minute. If this is belted to a six-inch axle or pulley on the driving-shaft, then the number of revolutions made by the wheel on the driving-shaft will be 220x^=880. If the shaft-pulley connecting with the axle of the interme- diate pulley has a diameter of ten inches while the axle h
. Elementary lessons in the physics of agriculture. Agricultural physics. 25 38. The High Speed of Centrifuges.— This is secured by a combination of wheels and axles connected with belts. Suppose the diameter of the fly-wheel of the engine is twenty- four inches and it makes two hundred and twenty revolutions per minute. If this is belted to a six-inch axle or pulley on the driving-shaft, then the number of revolutions made by the wheel on the driving-shaft will be 220x^=880. If the shaft-pulley connecting with the axle of the interme- diate pulley has a diameter of ten inches while the axle has a diameter of five inches, then the wheel of the intermediate pulley will make 880xY=1760 revolutions, and if the wheel of the intermediate pulley has a diameter of twelve inches while the axle of the centrifuge is three inches, then the centrifuge wiU make 1760 xY=''040 revolutions per minute. Change the diameter of a wheel or axle so as to give the centrifuge four thousand revolutions; six thousand revolutions; five thousand revolutions. 39. Exertion of Great Power.— When the exertion of a great lifting force is required at the expense of speed, this may be done by reversing the action of a train of wheels such as is considered in 38. In that case, if the power were ap- plied at the Centrifuge and the work done at the other end of the series, a load Avould be lifted very slowly indeed, but its weight could be very great. 40. The Inclined Plane.— This mechanical power is a rigid surface inclined to the line of the force or resistance which it is to overcome, and is represented in Fig. W^HO. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original King, F. H. (Franklin Hiram), 1848-1911. [Madison, Wis. ] The author
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